are you trying to run on this port so I can provide more tailored troubleshooting steps?

The most common reason for a connection error is that the software meant to be using that port hasn't started.

A port is a virtual point where network connections start and end. While ports 80 (HTTP) and 443 (HTTPS) are standard for the web, higher-numbered ports (1024–65535) are often used by specific software for specialized tasks.

Check your terminal, Docker Desktop, or Windows Services to ensure the relevant program is active. Check for Port Conflicts

To understand localhost:11501, we have to break it into two parts:

Temporarily disable your firewall or add an "Inbound Rule" to allow traffic on port 11501. Security Considerations

Open Terminal and type lsof -i :11501 . Firewall or Antivirus Blocking

This is the standard hostname given to the address of the local computer. It allows a device to connect to its own network services without needing a physical network interface or an internet connection.